Riveting machine



Sept? 1'7, 1940. K. BUTTER 'Rxvmmc MACHINE Filed Oct. 14, 1958 3`Sheets-She`et 1 /nventvn Sept. 17, 1940. K. BUTTER 2,215,388

' RIVETING MAcHINE Filed Oct. 14, 1958 3 Sheets-Sheet 2 /n venan rv/S,

Patented Sept. 17, 1940 UNITED 7 sTATEs mvE'rING MACHINE Karl Butter,` Rostock, Germany, assignor to Ernst Heinkel, Warnemunde, Germany Application October 14, 1938, Serial No. 235,043 In Germany November 4, 1936 9 Claims;

The present invention relates to a machine for riveting together sheetsI of metal or other material, for instance profile irons, and Vit relates in particular but not necessarily exclusively to a machine for riveting together thin imperforate sheets which are to be perforated by the shanks of the rivets.

It is an object of the invention Atoprovide a riveting machine comprising a reciprocable stamp and means for alternately bring a holder-up and a snap head die in operative relation to said stamp.

It is another object of the invention to provide an improved holder-up having means for eiect- 15 ing or permitting the removal of punchings from the shank of a rivet struck through sheets of work material.

It is a further object of the invention to provide novel means for supporting and/ or holding av incorporating for this purpose a countersunk.

holder-up.

It is a still further object of the invention to provide a machine by means of which imperforate sheets may be riveted together with a speed and ease comparable to the sewing together of fabrics by means of a sewing-machine.

Other objects and advantages of the invention will become apparent from the following description with reference to the accompanying drawings which illustrate some embodiments of the invention by way of example only. In the draw- 40 ings,

Figure 1 is a sectional elevation of a machine constructed in accordance with one embodiment ofthe invention,

Figure 2 is a sectional elevation of part of the.

45 machine, taken at right angles to Figure 1,

Figure 3 is a side elevation at right angles to Figure 1 I I I l Figure 4 is a sectional elevationof a machine constructed inaccordance with another embodi- 50 ment of the invention.

Figure 5 is a sectional view, on an enlarged scale, of a modified construction of holder-up,

Figure 6 is a sectional view of a sleeve incorporating a centering device, and

Figure 7 is a cross-sectional view taken on line A-B of the sleeve shown in Figure 6. Referring iirst to Figures 1, 2 and 3 the riveting machine comprises an upper part I and a lower part 2 between which the imperforate work- 50 pieces 3 and 4 are placed on the hollow rest 5 of the lower part 2, the rest being formed to suit the shape of the workpieces to be riveted. Arranged in the upper part I is a stamp 6 reciprocable vertically by any suitable means and partly surrounded by a slidable sleeve 'I co-operating with a coil spring 8 which tends to move the sleeve against a cap nut 3 screwed to a pipe I0 which surrounds the stamp 6. To the upper part I of the machine is fastened an arm II carryingan interchangeable ring I2 for the reception of the rivets to be fedby hand or automatically. The ring I2 is arranged in such a way as to allow of a slight downward movement when the stamp during its downward stroke presses the sleeve 1 on to the ring I2 which, therefore, is pressed on to th'e workpiece 3 before the stamp 6 reaches the rivet I3 to be struck through the workpieces 3 and 4. In the working head of the lower part 2 of the' machine there is arranged r slide I 4 carrying two diierent tools and reciprocable through the intermediary of a lever I5 driven by a crank guide drive I5a. vOne tool comprises a holder-up I6 having a countersunk surface I6a and provided with a boring I1 for the removal of the parts punched out from the workpieces. I8 tends to hold the holder-up I6 in aposition in which it does not project above the'upper surfacev of the slide I4. Close to the holder-up I 6 a snap-head die I9 is mounted in the slide I4 and is subject to the action of a spring 20 which tends to hold the die in such a position as not to project above the surface of the slide I4. The tools I6 and I9 respectively are brought into the working position by means of a spring-pressed spindle 2l connected to a piston 22 movable up and down in the head of the lower part 2 of the machine by means of an eccentric 23 driven in any suitable manner, for instance by a shaft 24 driven by a gear wheel 25 meshing with a gear wheel 26 driven in any suitable manner.

'I'he movements of the slide I4 andthe piston 22 respectively, are so timed that the piston is lifted as soon as the axis of one of the two .tools I6, I9 of the slide` I4 reaches the vertical axis of vthe hollow rest Sand of the stamp 6. The lifted `spindle 2I'strikes the lower surface of the tool to lift the latter until it reaches the shank of the rivet I3 struck through lthe workpieces by the stamp 6.

To prevent shocks from the stamp 6 from being transmitted to the drive and the bolts of the eccentric 23 the latter is arranged in such a way as toreach its upper'dead centre position not before the stamp has already struck the rivet.

The operation is as follows:

The workpieces 2 and 3 to be riveted are put on the rest 5, and a countersunk rivet I3 is fed to the movable ring I2. The slide I4 is moved into the position in which-the holderup"I6 and the hollow rest 5 are vertically aligned. The `pis- A spring.

' shank of the rivet through the workpieces, pressx ing the edges of the rivet hole into the counterto the holder-up I6 and to the vrest 5. In cony tinuing its stroke the stamp. 6 strikes the head of the rivet I3 in the ring I2 and strikes the sink of the hollow holder-up I6 through the centrai opening of which the parts stamped out are removed. The spindle 2| is then lowered to' allow the holder-up I6 to be withdrawn under the action of the spring I8 and the slide I4 is then moved into its other workingposition in which position the plunger 2| is again raised to lift the snap-head die I9 to set the closure head. The plunger 2| is then lowered so that the die is withdrawn by means of its spring 20 in order to allow the slide I4 toi be; shifted into its rst working position in which the holder-up and the stamp are vertically aligned.

Froml the foregoing it will be clear that for setting a rivet the stamp 6 is reciprocated once.

' vals At the same time the slide I4 is shifted into its two working positions, in one of which the holder,- up |6 acts to allow striking the shank of the rivet through the workpieces and in the other position the snap-head die forms the clure head of the rivet. The sheets to be riveted can be held and placed in position ready for striking by hand or by anyv suitable mechanism, the latter not forming part of the invention.

In the embodiment illustrated in Figure 4, the slide I4 is dispensed with, and the tool I6 is rigidly mounted on the head of the lower part 2 of the machine.l The rest 5 for the sheets'to be Ariveted is integral with a bridge 21 guided by means of bolts 28 on the head of the lower part 2, and subject to the action of springs 28a tending' to hom the bridge in the position shownin Figure 4. A bush 29 integral with the bridge 21 fits over the tool I6 with the countersink |6a and centres the bridge 21. The spindle 2| of the piston 22 moved up and down by'means of the eccentric 23 is constructed to enter the hollow tool I6 so that its upper surface is flush with the countersink ISaand forms a snap-head die' for i the shank ofthe rivet. is struck through the sheets a and 4. 'ro hold the rivet in suitable position when the stamp during' its downward stroke strikes the head of the rivet to -strike its shank through the sheets, a holding device is arranged on the upper part I of the machine. Said -device comprises two slides 30 mounted on the lower side of a plate 3|, fastened to the upper part I by means of two brackets 32 and provided with an opening 33 for the stamp 6 to pass'v through. The slides 30 are connected by means of screws 35 to spring-pressed bolts 34 adjustably mounted on the plate 3| and tending to close the jaws of the slides 30 around the shank of the rivet I3 which is in the suitable position for into the opening 33 of the plate 3|, it is held by the jaws of the slides 30 in the suitable position for being struck by the stamp 6 through the -sheets to be riveted which have been placed on the bridge 21. Just before the stamp 6 strikes 5 the head of the rivet I3 the sleeve 38 strikes the toggle levers 31 to push back the slides 30. As' soon as the rivet has been freed from the jaws the stamp touches the head of the rivet and presses it downwards together with the sheets 3 and 4 as the bridge 21 is yieldingly mounted. The bridge 21 follows the downward movement until vit rests on the surface of the head of the lower part 2 of the machine. In this position the hollow tool I6 is engaged-by thelower workpiece 4 so that the stampin its further stroke strikes the rivet through the workpieces at the same time pressing the thin sheets into the countersink of the tool. The parts of the workpieces stamped out fall through the hollow toolA I6 on to the piston 22 which is providedwith an opening substantially as shown 'in Fig. 2 to allow the parts stamped out to be carried oi. Now, the piston with the spindle 2| is lifted by means of the eccentric 23 so as to enter the hollow centre of the 25 tool. The stamp stops its downward stroke and is allowed to lift by about the amount 'by which l the bridge 21 was previously lowered. The tool I6 together with the top of the spindle 2| now forms a snap-headA die to set the closing head if the stamp now continues its downward stroke.

The stamp and the spindle then return to their initial positions in order to enable the machine to set a second rivet in the manner described.

As it has been found that with the machine as shown in Figures 1 and.2 the parts stamped out of the sheets 3 and 4 may stick lto the shank of the rivet and not fall out through the hollow tool I6, a device has4 been provided (Figure 5) for automatically removing said parts. This device comprises a slotted expansible chuck 40 inserted into the -tool I6. In a modification the-head of Vthe tool I5 may be slotted to allow of expansion.

When the parts 4| have been stamped out they will be driven into the expanding'opening of the 4| tool I6 or of thelchuck 40 vinserted therein'so that the parts 4| will be carried away if the tool and the chuck therein are taken away to allow the holder-up I3 to be brought into working position. A s the tool I6 is hollow as well as the l( chuck 40 the parts 4| stamped out are forwarded by the next parts stamped out and pressed furtheiinto the hollow tool until they reach the lower end of the tool I6 where they fall out and are removed from the machine in any suitable 6| manner.

If the internal diameter of the chuck can be made greater than the diameter of the shank of the rivet it will be sufficient if the expanding opening of the `chuck is adapted to loosen the 6| parts sticking to the shank of the rivet so as to make same fall out of the chuck.

In Figures 6 and-7 a centering chuck is shown for the rivets fed by an automatically feeding apparatus which is not shown asit does not form 5l part of theinventiom In this case the stamp 6 moves in a sleeve 42 having a lateral opening 43 for the entrance of the rivets being fed. To hold the rivet in the upright position it is fed between three balls 44 disposed in three radial borings 7l 45 in the sleeve 42 and protruding into the hollow central part of the sleeve 42 under the influence of springs 46 arranged in the said borings 45. Advantageously the borings. 45 are arranged obliquely to the stamp 6 to. facilitate'the balls Il I 44 being pushed back when struck by the stamp.

The rivet held in position by the centering balls 44 is freed from same when the stamp during its downward stroke pushes it to feed the rivet into the jaws of three radially movable centering levers 41 pivotally mounted in slots 48 in the sleeve 42. The levers 41 are pressed by springs 49 to close their jaws around the shank of the rivet, but when the s tamp during its downward stroke strikes the rivet into the sheets to be riveted the levers 41 are pushed back by the countersunk head of the rivet so that the head can pass freely between the three levers 41. After the rivet has been set the stamp is restored to its initial position to allow a further rivet to be fed between the-centering balls 44. The procedure described is then repeated.

The spring pressed ball chuck may be dispensed with if the levers 41 are constructed to centre the shank of the rivet automatically. This can be done by providing sloping enlargements 50 on the lower ends of the levers 41 in lsucha way that the shank of the rivet falling down the hollow sleeve 42 is guided by the sloping surfaces 50 of the levers 41 so to be centered in the desired central position.

I claim:

1. A machine for riveting imperforate work vpieces comprising, in combination,l a reciprocable stamp operative to strike a rivet through the work pieces, means for supporting a rivet in suitable -position to be struck by said stamp, means for supporting the work pieces to be riveted, holderup means operative through said work supporting means for holding up the work pieces while the rivet is being struck through the same, and means also operative through said work supporting means for forming a closure head on said rivet while the latter is engaged by the stamp.

2. A machine'as defined in claim 1, wherein the means for suporting the work pieces is provided with an aperture in alignment with the stamp, and whereinthe holder-up means and the means for forming a closure head on the rivet are operative through said opening.

3. A machine as -dened in claim 1, whereinA the holder-up means is provided with a throughbore for the removal of the material punched out from the work pieces by said rivet.

4. In a riveting machine, in combination, a.' reciprocable stamp operative to strike a rivet` .reciprocable stamp operative to strike 'a rivet through the work to be riveted, means for supporting a rivet in position to be struck by said stamp, meansfor supporting the work to be riveted, a slide reciprocable with reference to the work supporting means, a holder-up and a snap head die both operative through said Worksupporting means and carried by said slide, means for reciprocating said slide whereby to bring said holder-up and snap'head die alternately into alignment with said stamp, and means for operating said holder-up and die alternately through said work support when the latter are in alignment with said stamp.

6. In a riveting machine, in combination, a reciprocable stamp operative to strike a rivet through the work to be riveted, means for sup,

porting a rivet in position to be struck by said stamp, means for supporting the work to be riveted, a slide reciprocable with reference to the work supporting means, a holder-up and a snap head die both operative through said work supporting means and carried by said slide, means for reciprocating said slide whereby' to bring said holder-up and snap head die alternately into alignment with said stamp, means for operating said holder-up and die alternately through said work support when the latter are in alignment with said stamp, and means for reciprocating said stamp in timedrelation to theoperations of said holder-up and die.

'7. In a riveting machine, in combination, a

reciprocable stamp operative to strike a rivetl l position, and means for advancing said holder-up and die into the aperture of said work support when one or the other is in alignment therewith.

8. In a riveting machine, in combination, a reciprocable stamp operative to strike a rivet through the work to be riveted, an apertured work support, a slide reciprocable with reference to said worksupport, a holder-up and a snap head die both alternately movable into the aperture of the work support and carried by said slide, meansfor reciprocating said slide to bring said holder-up and die alternately into alignment with the aperture of said work support, means resiliently urging said holder-up and die away f-rom said work support, means for advancing said holder-up and die into the aperture of said work support when one or the other is in alignment therewith, and means for reciprocating said stamp in timel relation to the advance movements of said older-up and die.

9. A riveting machine comprising, in combination, a reciprocable stamp operative to strike a rivet through work to be riveted, an aperturedl work support, an apertured'rivet support, a slide reciprocable with reference to the work support,

a holder-up and a snaphead die carried by said slide, said holder-up and die being adapted for alternate alignment with the aperture of said work support, a spindle in .alignment with the aperture of said work support, means for reciprocating said slide whereby to bring said holder-up and die alternately in alignment with theaperture of said work support, means normally maintaining said holder-up and die in .retracted position, means for reciprocating saidv spindle whereby to advance said holder-up and snap head die alter-v nately into said work support, and means for reciprocating said stamp in timed relation to the advance movements of said holder-up and die.

' y KARL BUTTER. 

